KR100837941B1 - Cast hollow crankshaft and method of manufacturing the same - Google Patents

Cast hollow crankshaft and method of manufacturing the same Download PDF

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Publication number
KR100837941B1
KR100837941B1 KR1020067023916A KR20067023916A KR100837941B1 KR 100837941 B1 KR100837941 B1 KR 100837941B1 KR 1020067023916 A KR1020067023916 A KR 1020067023916A KR 20067023916 A KR20067023916 A KR 20067023916A KR 100837941 B1 KR100837941 B1 KR 100837941B1
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KR
South Korea
Prior art keywords
core
crankshaft
journal
hollow
mold
Prior art date
Application number
KR1020067023916A
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Korean (ko)
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KR20060129548A (en
Inventor
도모유키 도비타
미쓰히로 시바노
겐지 하야마
Original Assignee
가부시끼가이샤 리켄
토요타 찌도샤 카부시끼카이샤
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Priority to JPJP-P-2004-00121829 priority Critical
Priority to JP2004121829A priority patent/JP4354330B2/en
Application filed by 가부시끼가이샤 리켄, 토요타 찌도샤 카부시끼카이샤 filed Critical 가부시끼가이샤 리켄
Publication of KR20060129548A publication Critical patent/KR20060129548A/en
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Publication of KR100837941B1 publication Critical patent/KR100837941B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/10Cores; Manufacture or installation of cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/22Moulds for peculiarly-shaped castings
    • B22C9/24Moulds for peculiarly-shaped castings for hollow articles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00Shafts; Axles; Cranks; Eccentrics
    • F16C3/04Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06Crankshafts
    • F16C3/08Crankshafts made in one piece
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00Shafts; Axles; Cranks; Eccentrics
    • F16C3/04Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06Crankshafts
    • F16C3/14Features relating to lubrication
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49229Prime mover or fluid pump making
    • Y10T29/49286Crankshaft making
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/21Elements
    • Y10T74/2173Cranks and wrist pins
    • Y10T74/2174Multiple throw

Abstract

The present invention further reduces the weight of the cast hollow crankshaft by removing the core during casting, and eliminates the bending of the core during the manufacture of the crankshaft and the rise of the pouring. Do not. In the cast hollow crankshaft of an internal combustion engine, the cross section of the hollow part of the journal part and / or the fin part forms an oval shape, and the hole of the journal part and the fin part is formed by subtracting the core during casting by the core. The hollow part cross section elliptical shape of an arm part is comprised. An elliptical core that bends in the horizontal direction and has a long diameter portion in the vertical direction in the journal portion and / or the pin portion is used. The composite core is provided with a core having a plurality of skirting portions extending in a horizontal direction and extending toward the mold in the journal portion and / or the pin portion, or having a plurality of skirting portions extending toward the mold in the vertical direction. The part and the hole are integrally formed.
Hollow, crankshaft, crankshaft

Description

Casting hollow crankshaft and its manufacturing method {CAST HOLLOW CRANKSHAFT AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to a cast hollow crankshaft for use in an internal combustion engine, in particular a hollow crankshaft cored out during casting, and a method of manufacturing the same.

Internal combustion engines require low fuel consumption and high performance, and crankshafts are also required to be lighter and reduce frictional losses. In addition, with the recent reduction in cost, the simplification of the manufacturing process is essential. Generally as a material of a cast crankshaft, ductile cast iron etc. are used. However, in order to secure mechanical properties, there is a problem in that the weight of the whole increases due to the necessity of taking the diameter of the shaft and the like, and the torque at the start is increased.

As a solution to such a problem, a crankshaft is known which is made lightweight and hollowed out by fusing a thin metal pipe by enveloped-casting (see Patent Document 1, for example). However, this makes it difficult to manufacture the thin metal pipe which has the branch shape of the small diameter pipe which becomes a hole part in the thin metal pipe bent in the axial direction used as a hollow part, and also uses the chiller of a pipe at the time of casting ( Due to the chiller effect, there are problems in manufacturing technology, quality and cost, such as lack of toughness due to hardening inside the crankshaft, internal defects caused by adhesion between pipe and cast iron or oxide on pipe surface. no.

Moreover, it is known to reduce the weight of the crankshaft pin part, the journal part, and the arm part by continuously removing the core during casting by casting the core by the core (for example, refer to Patent Document 2). It is known that the cross section of the center of an arm part is enlarged and the whole core is supported by the baseboard of both ends by pointing out the lack of intensity | strength of the arm part core by this, and forming an expansion part in a crankshaft arm part shoulder. (For example, refer patent document 3). However, since a large stress is applied to the crankshaft, there is a limit to the thinning of the arm portion by subtracting the core during casting, and the size and position of the expansion part are also limited from the engine design. In addition, in the structure in which the entire core is supported by the baseboard at both ends, the core strength of the arm part is larger and heavier than the arm part because the core of the journal part or the pin part is larger and larger for the weight of the crankshaft, even if the arm part core cross-sectional area is increased. Not enough. In particular, when an integral core bent in a multi-cylinder crankshaft or the like is used, since a large stress is partially applied unlike a straight core without bending, strength is insufficient even if the arm portion core cross-sectional area is increased. As a result, there is a problem that the core bends when the core is set in the mold, or the core rises or breaks during pouring.

Chalets are generally used to compensate for the lack of strength in the core. However, the chapel contains a material component different from the molten metal which is subjected to various metal coating treatments, for example, cast iron casting anticorrosion treatment, and the chapel finally melt-bonds with the molten metal. Since it becomes part of a casting, it is not a preferable method for a hollow crankshaft. In addition, if cast sand remains in the hollow part, it will fall off during use and greatly affect the engine. Therefore, there is no technical problem since the hollow part after removing the core during casting is completely removed from the casting sand. have. In addition, since the pores of the journal portion and the pin portion of the crankshaft are formed by processing, burrs and debris remain in the hollow portion, which causes the above problems.

On the other hand, in general, an increase in the amount of resin added to the foundry sand may be performed to improve the core strength, but the increase in the resin is accompanied by gas generation, and as a result, internal defects are likely to occur, which is not a preferable measure.

For this reason, in recent years, through holes are formed in the connecting rod bearing portion of the pin portion from the journal portion by processing, and the means for supplying oil to the connecting rod and the pin portion from the supply port formed in the journal portion is mainly. It is used (for example, refer patent document 4 and nonpatent literature 1).

Patent Document 1: Japanese Patent Application Laid-open No. 56-147914

Patent Document 2: Japanese Utility Model Publication No. 57-139722

Patent Document 3: Japanese Utility Model Publication No. 59-177820

Patent Document 4: Japanese Patent Application Laid-Open No. 07-027126

[Non-Patent Document 1] Automotive Technology Handbook, <Second Disclosure>, Design

However, according to the method in the above processing, it is impossible to significantly reduce the weight as in the above-described casting method, and furthermore, by the aluminumization of the cylinder block, the gap in the journal portion becomes larger from the thermal expansion difference, and the oil from the journal portion to the crank shaft is increased. There is a problem that oil leakage increases at the time of supply, resulting in poor oil supply efficiency. In addition, it requires a difficult process of machining oil holes obliquely from the journal portion to the connecting rod bearing portion, and there is a problem in terms of production and cost.

Accordingly, the inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, the core cross section is formed in an elliptical shape, and the baseboard portion integrated with the core is formed in the perforations of the journal portion and the pin portion of the crankshaft to perform injection. The inventors have found that it is possible to reduce the weight and at the same time form the pores, and to effectively prevent the bending of the core and the rise of the pouring, thereby completing the present invention.

The present invention has been made on the basis of such experiments, and it is accurate and excellent in manufacturability by eliminating the bending of the core and the rise of the pouring in the crankshaft production, together with the weight reduction of the cast hollow crankshaft by core removal during casting. An object of the present invention is to provide a cast hollow crankshaft which requires no pore processing and a method of manufacturing the same.

[Means for solving the problem]

In a first hollow crankshaft of an internal combustion engine, the first aspect of the present invention is formed by removing the core during casting by the core from the pores of the journal portion and / or the fin portion.

In the first aspect of the present invention, the skirting portion for forming the pores may be integrally formed with the core for forming the hollow portion, or may be assembled later and integrated with the core. By the baseboard portion integrated with the core, it is possible to form a hole without requiring subsequent processing.

As for the 2nd aspect of this invention, it is preferable that the hollow part cross section of a journal part and / or a pin part has comprised ellipse shape. In this case, by making the hollow section end face in an ellipse shape, the weight of the crankshaft can be further reduced. In addition, by making the hollow section end face in an ellipse shape, the hollowing of the pin section and the journal section is effective to reduce the weight of the crankshaft, by making the thickness of the position (direction) requiring strength thicker and making the other section thinner in an ellipse shape. Optimum weight reduction is possible. In addition, the strength of the pin part and the journal part which become the inflection part of a bending core also needs to be improved on a manufacturing surface, and an elliptic hollow shape is effective also in core strength improvement. In addition, the oval shape also has the advantage of being able to shorten the hole-forming core (curved base).

It is preferable that the cross section of the hollow part of an arm part has an ellipse shape in the 3rd aspect of this invention. In this case, by making the hollow section end face in an ellipse shape, the hollowing of the arm part is effective to reduce the weight of the crankshaft, and it is optimal by making the thickness of the position (direction) requiring strength thick and making the other part thin in an ellipse shape. Weight reduction is possible. In addition, the strength of the arm portion of the bent core is also required on the production side, and the elliptic hollow shape is also effective for improving the core strength.

According to a fourth aspect of the present invention, in the production of the cast hollow crankshaft or the raw material according to the first to third aspects of the present invention, the cross section is bent in the horizontal direction and the cross section is perpendicular to the journal portion and / or the pin portion. An elliptic core having a long diameter portion is used.

In the fourth aspect of the present invention, the elliptical shape having the long diameter portion in the vertical direction can improve the strength of the core itself and shorten the length of the core serving as the skirting portion forming the hole in the vertical direction. It becomes possible, and can stabilize a core more.

In addition, a raw material means here the raw process after casting.

In addition, in an elliptical shape having a long diameter portion in the vertical direction, in a core configuration supported at both ends, a force in a direction that is bent to a portion between the supporting points by gravity is applied, whereas a buoyancy force is applied to the core during melt pouring. Therefore, by making the ellipse shape in which the vertical direction is thickened and increasing the core strength, staggering and the like can be prevented. In addition, staggering prevention can be ensured by making a part of the core of a perpendicular direction into a skirting board.

According to a fifth aspect of the present invention, in the manufacture of the cast hollow crankshaft or the raw material of the fourth aspect of the present invention, a plurality of skirting plates which bend in the horizontal direction and extend toward the mold in the journal portion and / or the pin portion are provided. The core provided with the part is compositely cast to form the hollow part and the hole together.

In the fifth aspect of the present invention, the journal portion or the pin portion, which is heavy in the core itself, enables the journal portion and the pin portion to be fixed by the skirting board, so that a chapel for reinforcing the core is not required. Along with being able to facilitate injection, it is possible to form pores where subsequent processing is unnecessary.

According to a sixth aspect of the present invention, in the production of the cast hollow crankshaft of the fourth or fifth aspect of the present invention or the raw material thereof, the sixth aspect of the present invention is directed to the mold in a direction perpendicular to the journal portion and / or the pin portion. A core having a plurality of elongated baseboard portions was compositely cast to integrally form the hollow portion and the hole.

In the sixth aspect of the present invention, the core itself or the pin portion or the journal portion and the pin portion can be fixed from the top and bottom by a skirting board extending in the vertical direction, so that the core itself is used for reinforcing the core. It is possible to facilitate more accurate injection without the need for flits and to form unnecessary pores for subsequent processing.

In the seventh aspect of the present invention, in the manufacture of the cast hollow crankshaft or the raw material of the fourth to sixth aspects of the present invention, the cross section of the core of the arm portion has an elliptical shape having a long diameter portion in the vertical direction. .

1 is a cross-sectional view of a cast hollow crankshaft according to one embodiment of the present invention.

2 is a cross-sectional view taken along line A-A of FIG.

3 is an example of a partial cross-sectional view (vertical direction) of a mold and a core used in the production method of the present invention.

4 is an example of a partial cross-sectional view (horizontal direction) of a mold and a core used in the manufacturing method of the present invention.

FIG. 5 is an example of the B-B cross section of FIG.

6 is another example of the B-B cross-sectional view of FIG. 2.

FIG. 7 is an example of C-C cross section of FIG.

EMBODIMENT OF THE INVENTION Below, embodiment of the casting hollow crankshaft of this invention and its manufacturing method is demonstrated in detail based on drawing.

1 and 2 are cross-sectional views of a cast hollow crankshaft (material) according to one embodiment of the present invention.

The crankshaft main body 1 has a plurality of bent portions in the horizontal direction and a hollow portion in which an elliptical journal portion 4 and an arm portion 15 have a cross section, and a circular pin portion 5 and a cross-sectional end portion which have a cross section. Have (3) The cross section of the pin part 5 and both short-axis parts can also be made elliptical shape.

The journal part 4 and the pin part 5 form the several hole 6 by the skirting board integrated with the core. The perforations 6 of the journal part 4 and the pin part 5 can be formed in the upper and lower sides, or both with respect to the journal part 4 and the pin part 5, respectively. The size of the oil hole 6 varies depending on the size of the crankshaft itself, and the like, but in general, an automobile engine preferably has a diameter of 5 mm or less.

The crankshaft main body 1 is provided with the pin part 7 of the connecting rod bearing part, and the crank weight 8 of a balance weight.

In this embodiment, the case where only the journal part 4 was made into the elliptical shape of the hollow part cross section was demonstrated, but both the journal part 4 and the fin part 5, or only the fin part 5 may be sufficient. Although both are the most preferable embodiment, it may be any one depending on the shape size of a crankshaft.

In addition, the reason why the hollow cross section of the arm part 15 of a hollow crankshaft makes elliptical shape is the same as that of the journal part 4 and the pin part 5.

5 and 7 are radial cross sections of the journal portion 4 and the pin portion 5 of the cast hollow crankshaft (material) shown in FIG. 1. Here, the hollow part 3 is an elliptical shape of long diameter in a vertical direction, and has the hole 6 in an up-down direction. In this embodiment, the ratio of the long and short diameters of the elliptical shape of the hollow section cross section is set to 3: 2, but it can be changed within a range capable of securing strength. In addition, in order to reduce weight, it is good also as a square with a rounded angle shown in FIG.

Next, the manufacture of the hollow crankshaft which concerns on this embodiment is demonstrated.

After molding the mold (sand mold) 9 shown in FIG. 3 and FIG. 4, both ends of the core 2 are supported as the skirting portion 11 on the lower mold before the upper mold is covered, and at the same time, the journal portion 12 and the pin portion The baseboard portion (13) is also fixed to the mold (sand mold) 9 to prevent deformation and staggering of the core 2, and then the upper mold is assembled and the molten metal is injected to form the hollow portion of each portion. 4) and the hole 6 of the fin part 5 are also formed.

Here, the baseboard portion 11 refers to a portion corresponding to a handle for fixing the core 2 to the mold (sand mold) 9, and in this embodiment, portions corresponding to the handle are positioned at both ends. do. In addition, the journal part 12 and the pin part 13 also become a base part by fixing the core 2 to the mold (sand mold) 9. In the present embodiment, the hole 6 is formed by the substantially conical journal portion 12 and the pin portion 13 having a draft angle of Ø5 mm or less.

As a material used for casting, ductile cast iron, alloy cast iron, etc., such as FCD700, can be used.

In addition to the skirting portion of the journal portion 12 and the fin portion 13, an opening portion may be formed by forming a skirting portion in the horizontal direction of the pin side portion 14 of the crankshaft. Thereby, while fixing the core 2 in the horizontal direction, it is possible to easily perform degassing treatment such as shot blast from the opening.

On the other hand, in the desalination treatment of the cast hollow crankshaft (material) integrally casting the hollow part 3 and the oil hole 6 by the manufacturing method of the cast hollow crankshaft which concerns on this embodiment, such as a Kolen process, etc. Molten salt processing can be performed and it can also carry out combining the manufacturing method of the cast hollow crankshaft which concerns on this embodiment, and a Kolen process.

As mentioned above, the hollow crankshaft cast by the manufacturing method of the casting hollow crankshaft which concerns on this embodiment can be made into a healthy hollow casting which does not have defects, such as a shrinkage cavity, inside, and is solid The weight reduction of 10 to 20% is possible compared to the casting. In addition, lubricating oil can be used as center lubrication from the crankshaft end, thereby providing an efficient oil lubrication path. In addition, the manufacturing and setting of the core can be simplified, and the manufacturability is improved because the hole processing becomes unnecessary.

In addition, since the weight reduction of the cast hollow crankshaft in this embodiment does not aim at weight reduction from the outside, it is aimed at weight reduction from the inside of the journal part 4 and the pin part 5 of a crankshaft, and therefore it cranks. Although the maximum stress of a shaft arises in the edge part R of the rolling process of the pin part 5, it can be set as the shape which ensured bending rigidity, without reducing the stress of this part.

  [Effects of the Invention]

According to the present invention, by hollowing the inside of the crankshaft using the core, it is possible to reduce the weight without deteriorating mechanical properties and to form the pores of the journal portion and the pin portion integrally so that the processing of the pores is unnecessary.

In addition, according to the present invention, the hollow portion is formed in an ellipse shape, and the hollow portion of the journal portion and / or the pin portion is removed by the core during casting, whereby the crankshaft can be reduced in weight and low cost due to improvement in manufacturability. It is possible to paint.

In addition, according to the manufacturing method of the present invention, by using a core that is bent in the horizontal direction and provided with a channel portion in the journal portion and / or the pin portion, the core can be reliably fixed, accurate injection can be carried out, and the pore Can be formed. In addition, by making the core of the journal portion or the pin portion elliptical shape having the long diameter portion in the vertical direction, the strength of the core itself and the weight of the crankshaft can be reduced.

Claims (7)

  1. In the cast hollow crankshaft of an internal combustion engine, the cross section of one or both of the journal part and the fin part is elliptical, and the hole of one or both of the journal part and the fin part is removed by the core during casting. A cast hollow crankshaft, characterized in that it is formed by cored out.
  2. In the cast hollow crankshaft of an internal combustion engine, the cross section of one or both of the journal part and the pin part has an elliptical shape, and the cross section of the hollow part of the arm forms an ellipse shape, and either or the journal part and the pin part. A cast hollow crankshaft, characterized in that both holes are formed by cores cored out during casting.
  3. After molding the mold, the core is supported on the lower mold, the upper mold is assembled, and molten metal is poured into the mold, thereby manufacturing the cast hollow crankshaft according to claim 1,
    A method for producing a cast hollow crankshaft, characterized by using an elliptic core that is bent in the horizontal direction and has a long diameter portion in one or both of the journal portion and the pin portion in the vertical direction.
  4. After molding the mold, the core is supported on the lower mold, the upper mold is assembled, and the molten metal is poured into the mold to manufacture the cast hollow crankshaft according to claim 2,
    A method for producing a cast hollow crankshaft, characterized by using an elliptical core that is bent in a horizontal direction and has a long diameter portion in one or both of the journal portion and the pin portion in the vertical direction.
  5. The method according to claim 3 or 4,
    Characterized in that the hollow part and the hole are integrally formed by complex-casting a core having a plurality of skirting portions extending in a horizontal direction and extending toward a mold on one or both of the journal portion and the pin portion. Method of manufacturing a cast hollow crankshaft.
  6. The method according to claim 3 or 4,
    A core having a plurality of skirting sections extending in a horizontal direction and extending toward a mold in a vertical direction on one or both of the journal portion and the pin portion is formed by complex casting, thereby forming hollow portions and holes. The manufacturing method of the casting hollow crankshaft made into.
  7. The method of claim 4, wherein
    A cross section of a core of an arm portion forms an ellipse shape having a long diameter portion in a vertical direction, wherein the cast hollow crankshaft is produced.
KR1020067023916A 2004-04-16 2005-03-22 Cast hollow crankshaft and method of manufacturing the same KR100837941B1 (en)

Priority Applications (2)

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JPJP-P-2004-00121829 2004-04-16
JP2004121829A JP4354330B2 (en) 2004-04-16 2004-04-16 Cast hollow crankshaft and manufacturing method thereof

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KR20060129548A KR20060129548A (en) 2006-12-15
KR100837941B1 true KR100837941B1 (en) 2008-06-13

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US (1) US20070193405A1 (en)
EP (1) EP1767288B1 (en)
JP (1) JP4354330B2 (en)
KR (1) KR100837941B1 (en)
CN (1) CN100473477C (en)
BR (1) BRPI0509922B1 (en)
RU (1) RU2331495C1 (en)
TW (1) TWI338088B (en)
WO (1) WO2005099933A1 (en)

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CN102019357B (en) * 2009-09-23 2013-01-16 沈阳铸造研究所 Manufacturing method of complicated fine hollow sand core
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FR2957281B1 (en) * 2010-03-12 2012-03-16 Peugeot Citroen Automobiles Sa Process for manufacturing a hollow crankshaft, the hollow crankshaft obtained thereby and a motor equipped with said crankshaft
CN101813121B (en) * 2010-04-29 2012-05-30 北京中清能发动机技术有限公司 Movable shaft for end shaft-movable shaft mechanism and equipment thereof
DE102011080688A1 (en) * 2011-08-09 2013-02-14 Ford Global Technologies, Llc Crankshaft, particularly casted crankshaft for internal combustion engines, has two base pins and crank pin, which is connected with adjacent base pin by crank webs, where base pin and crank pin comprise axial through-holes
US8533946B2 (en) * 2011-12-14 2013-09-17 GM Global Technology Operations LLC Method of manufacturing a crankshaft
US20140367064A1 (en) * 2013-06-13 2014-12-18 GM Global Technology Operations LLC Method of simultaneously manufacturing a plurality of crankshafts
DE102013223179A1 (en) * 2013-11-14 2015-05-21 Bayerische Motoren Werke Aktiengesellschaft Complex cast component and casting process for this
DE102014112461A1 (en) * 2014-08-29 2016-03-03 Fev Gmbh A method of manufacturing a water cooling system in a cast cylinder head and a water cooling system in a cast cylinder head
US9388846B2 (en) * 2014-09-18 2016-07-12 GM Global Technology Operations LLC Core for cast crankshaft
US20160084295A1 (en) * 2014-09-22 2016-03-24 GM Global Technology Operations LLC Method of manufacturing a crankshaft from a high shrink metal alloy
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RU2331495C1 (en) 2008-08-20
EP1767288A4 (en) 2009-08-05
EP1767288A1 (en) 2007-03-28
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JP2005305450A (en) 2005-11-04
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BRPI0509922A (en) 2007-09-18
WO2005099933A1 (en) 2005-10-27
RU2006140370A (en) 2008-05-27
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EP1767288B1 (en) 2014-07-23
JP4354330B2 (en) 2009-10-28

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